Passive: Ranking up Void Assault allows Kha'Zix to evolve one of his abilities.
Active: Kha'Zix stealths for 1 second, activating Unseen Threat and increasing his movement speed by 40%. Void Assault can be cast a second time within 10 seconds of the first cast.
Evolved Active Camouflage: Void Assault can be cast three times and Kha'Zix takes 50% reduced damage while in stealth.
Cost: 100 mana
Cooldown: 100 / 90 / 80 seconds

+75 Attack Damage
UNIQUE Passive: +20% Life Steal
UNIQUE Passive: Your basic attacks can now overheal you. Excess life is stored as a shield that can block 50-350 damage, based on champion level.
This shield decays slowly if you haven't dealt or taken damage in the last 25 seconds.

Bild explantion and in game fighting

When u start to play Khazix you start a blue buff and go to red wolves then go to red. I insist you not to gank with your buffs until you get the burtalizer and your chances increase with the mobility boots. The first thing you notice it that in this build there is not any mana or mana regeneration using this build u will rely on your Q its best to keep getting blue buffs the cool downs from the black cleaver and ghost blade will make it easy for you to make kill and leave in a seconds especially for swishy champions like teemo.
In game fights 1v1
so when u see a champs by its self the are easy to kill.
You open up with your W then your E use your Q then ether ult or wait a few seconds for W. If they are not dead your Q will be off of CD as sonn as your done using W.
Team fights
you open up the same way you would in a 1v1
but after you use W,E,and Q combo you use your ult and focus the main
threat

Skillorder

First evolution: go for E sense this is jungle build, so ganking is the one thing your responsible for, by having the E as your first evolution ganks are easier
Second evolution: Go for your R this will help you get successful kill ad are able to spam your passive easier.
Last evolution: In this build the first thing you will see once you have finished the build you will be able to put out huge amounts of damage with your Q so increasing your range will greatly increase you kill rate will spike up and chasing an opponent and killing them is easy